Sendmail 寄信回應 host name lookup failure. 問題 - BBS

請問一下,
我的 sendmail server 在寄信到 [email protected] 時一直回應 host name lookup failure.
可是我在同一台 mail server 上可以查到對方的 mx 記錄,
請問這是什麼問題, sendmail 有沒有相關的 debug 模式或命令可以查問題在那裡?


Mar 14 11:03:22 xxxxx sendmail[64264]: p2E33HmN064264: [email protected], ctladdr=chency (1001/1000), delay=00:00:05, xdelay=00:00:05, mailer=relay, pri=30068, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (p2E33MSk064265 Message accepted for delivery)
Mar 14 11:03:25 xxxxx sm-mta[64283]: p2E33MSk064265: to=<[email protected]>, ctladdr=<[email protected]> (1001/1000), delay=00:00:03, xdelay=00:00:03, mailer=esmtp, pri=30394, relay=mailspamsqr.twca.com.tw., dsn=4.0.0, stat=Deferred: Name server: mailspamsqr.twca.com.tw.: host name lookup failure

------------------------------------------------------------
> nslookup -type=mx twca.com.tw
Server: 139.175.55.244
Address: 139.175.55.244#53

Non-authoritative answer:
twca.com.tw mail exchanger = 11 mailspamsqr.twca.com.tw.

Authoritative answers can be found from:

------------------------------------------------------------
> nslookup mailspamsqr.twca.com.tw.
Server: 139.175.55.244
Address: 139.175.55.244#53

Non-authoritative answer:
Name: mailspamsqr.twca.com.tw
Address: 203.67.10.134
Name: mailspamsqr.twca.com.tw
Address: 219.80.19.162


--